Android进度条

使用异步任务来实现

话不多说上代码

activity_progress.xml

Progress.java

package com.example.asynctaskdemo;

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.ProgressBar;
import android.widget.TextView;

public class Progress extends Activity {

	ProgressBar progressBar;
	TextView textView;
	MyAsyncTask myAsyncTask;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_progress);
		progressBar=(ProgressBar) findViewById(R.id.progressBar);
		textView=(TextView) findViewById(R.id.textView1);
		myAsyncTask=new MyAsyncTask();
		myAsyncTask.execute();
	}

	@Override
	protected void onPause() {
		
		super.onPause();
		//能够执行另一个异步任务时把上一个异步任务取消掉
		if (myAsyncTask!=null && myAsyncTask.getStatus()==AsyncTask.Status.RUNNING){
			myAsyncTask.cancel(true);
		}
	}
	class MyAsyncTask extends AsyncTask{

		@Override
		protected void onPostExecute(Void result) {
			// TODO Auto-generated method stub
			super.onPostExecute(result);
			startActivity(new Intent(Progress.this,MainActivity.class));
			Progress.this.finish();
		}
		@Override
		protected Void doInBackground(Void... params) {
			for(int i=0;i<100;i++){
				if (isCancelled()){
					break;
				}
				publishProgress(i);
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
			return null;
		}
		
		@Override
		protected void onProgressUpdate(Integer... values) {
			super.onProgressUpdate(values);
			if (isCancelled()){
				return;
			}
			progressBar.setProgress(values[0]+1);
			textView.setText(values[0]+1+"%");
		}
	}

}